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Chapter 11

Problem 9

Suppose the correlation coefficient between FEV for 100 sets of identical twins is \(.7,\) whereas the comparable correlation for 120 sets of fraternal twins is .38 . What test procedure can be used to compare the two correlation coefficients?

Problem 47

LD72 and LD73 are variable names for the actual blood-lead levels in 1972 and \(1973,\) respectively. Use regression methods to assess the relationship between MAXFWT and the actual blood-lead level(s), while controlling for age and sex. Assess the goodness of fit of the model(s) you propose.

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